Jerry Pournelle died on Friday, peacefully in his sleep. With his death, America lost an important figure.

Pournelle wrote many bestselling science fiction novels, both on his own and with Larry Niven. Of these, "Lucifer’s Hammer" and "The Mote in God’s Eye," both major bestsellers, are probably the best known, though I think that artistically, "Inferno" — a reboot that I think Dante Alighieri himself would have approved — was the best. (Does a novel set in Hell count as science fiction? I don’t know, but it was exceptionally good).

But Pournelle didn’t just write fiction. His 1970 book with Stefan Possony, "The Strategy of Technology," outlined a strategy for winning the Cold War (with among other things, an emphasis on strategic missile defense) that was largely followed, and successfully, by the Reagan administration. He was a driving force behind the Citizens Advisory Council on National Space Policy in the 1980s that helped lay the groundwork for today’s booming civilian space launch industry. And, for me, his wide-ranging columns in Galaxy Magazine, back when it was edited by star editor James Baen, were particularly influential.

I was a kid in the 1970s, which was not a great era to be a kid. We had Vietnam and Watergate, the Apollo space program quit abruptly, oil prices skyrocketed and so did inflation. Even a hamburger was expensive.

And while that was going on, the voices in the media were all preaching gloom and doom. Stanford professor Paul R. Ehrlich, in his book "The Population Bomb," was predicting food riots in America due to overpopulation. A group called The Club of Rome published a report titled "The Limits to Growth" that suggested it was all over for Western technological civilization. Bookstore displays were filled with books like "The Late Great Planet Earth" that announced the end times. And if that weren’t enough, most people figured we were heading for a global thermonuclear war with the Soviet Union. It looked like we were headed for some sort of apocalyptic future in which Charlton Heston would be the only survivor besides a few apes or mutants.

But Jerry Pournelle never bought it. In his Galaxy columns — eventually collected and published in book form, and still in print — he actually did the math. The fact was, he reported, we could not only survive but, in his words, survive with style.

Claims of resource limitations were bunk, easily disproved with available data. And beyond the resources of Earth, there were the effectively limitless resources of the solar system: Energy from the Sun, captured by orbiting power satellites that never had to shut down, materials from the asteroids, and an expansionary frontier that would prevent the growth of damaging zero-sum politics on Earth.

Some people found such claims outlandish in the 1970s, but we’re pretty much living in Pournelle’s world now. The 1970s “Energy Crisis” and its turn-of-the-millennium equivalent, “Peak Oil,” have been undone by technological advances in the form of fracking. Private companies are launching rockets into space at a furious rate — Elon Musk’s SpaceX is on track to launch more rockets than Russia this year — and there are even private companies (companies, plural) working on asteroid mining.

I suspect that a lot of the people working on these things were, like me, influenced by Pournelle’s writing. (I know that some of them were, because they’ve told me so, and I doubt those are the only ones.) At one of the gloomiest times in American history, Pournelle offered not only hope, but a plan. We should all be grateful for that. I certainly am.

Glenn Harlan Reynolds, a University of Tennessee law professor and the author of "The New School: How the Information Age Will Save American Education from Itself," is a member of USA TODAY's Board of Contributors.